package ioperation;

import book.Book;
import book.BookList;

import java.util.Scanner;

public class DelOperation implements IOperation{
    @Override
    public void work(BookList bookList) {
        System.out.println("删除图书...");
        //删除操作 使用后一个覆盖前一个的方法
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入你要删除的书名：");
        String name = scanner.nextLine();

        int size = bookList.getUsedSize();

        int pos = -1;
        int i = 0;
        for (; i < size; i++) {
            Book book = bookList.getBooks(i);
            if(book.getName().equals(name)){
                System.out.println("找到了这本书！");
                pos = i;
                System.out.println(book);
                break;
            }
        }

        if(i == size){
            System.out.println("没有你要删除的书！");
            return;
        }

        // 开始删除
        for(int j = pos;j < size - 1;j++){
            Book book = bookList.getBooks(j + 1);
            bookList.setBooks(j,book);
        }

        bookList.setBooks(size - 1,null);

        bookList.setUsedSize(size - 1);
        System.out.println("删除成功！");
    }
}
